[lldb][bindings] Fix module_access handling of regex

Fixes broken support for: `target.module[re.compile("libFoo")]`

There were two issues:
1. The type check was expecting `re.SRE_Pattern`
2. The expression to search the module path had a typo

In the first case, `re.SRE_Pattern` does not exist in Python 3, and is replaced
with `re.Pattern`.

While editing this code, I changed the type checks to us `isinstance`, which is
the conventional way of type checking.

From the docs on `type()`:

> The `isinstance()` built-in function is recommended for testing the type of an object, because it takes subclasses into account.

Differential Revision: https://reviews.llvm.org/D133130